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      <title>Stereo</title>
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      <div class="title_topic4" id="xps10_pagetitle">Stereo</div>
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            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
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               <div class="para_note">
                  <p class="para_note_body">  Stereo is available on selected UNIX workstation configurations only. Refer to the Graphics Configuration Guide for information on stereo support.</p>
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      <p class="para_topic">The Stereo option enables the stereo display mode for the work view, which allows you to visualize NX parts in 3D. Stereo mode works with the CrystalEyes Stereoscopic viewing system.</p>
      <p class="para_topic">The CrystalEyes system is manufactured by StereoGraphics Corporation. The system includes an emitter device that is connected to the workstation graphics device or monitor cable, plus special glasses that respond to a signal from the emitter device. The emitter and glasses provide a 3-dimensional appearance to the NX graphics window. Separate emitter devices are required for each workstation, but any number of CrystalEyes glasses can be used with a single emitter. A UGSPLM sales representative can provide information about obtaining the CrystalEyes system.</p>
      <p class="para_topic">The stereo display mode is intended mainly for short periods of visualization or demonstration, and only a few NX view operations are available while stereo mode is enabled.</p>
      <p class="para_topic">If the graphics window background is black or very dark in color, it is automatically lightened when Stereo is enabled. Lightening the background color reduces irritating ghosting effects. If the background is black, then it becomes dark gray. If the background is another very dark color, it becomes a slightly lighter shade of that color.</p>
      <div class="title_division">Operating in Stereo Mode</div>
      <p class="para_division">The Stereo button may be inactive (grayed out) on the Visualization dialog. This could be due to any of the following conditions:</p>
      <ul>
         <li>
            <p class="para_item">NX determines that the workstation configuration does not support stereo. Consult the Graphics Configuration Guide for information on configurations that support stereo.</p>
         </li>
         <li>
            <p class="para_item">The Ugraf***.stereo resource is not set to TRUE.</p>
         </li>
      </ul>
      <p class="para_division">When you enter stereo mode, NX automatically switches to the Gateway application.</p>
      <p class="para_division">Stereo mode is enabled with both perspective and parallax effects. Parallax is the attribute that causes the part to appear in front of or behind the screen.</p>
      <div class="title_division">Macro Support</div>
      <p class="para_division">Macro recording and playback is supported in stereo mode, but you must begin recording before choosing the Stereo option.</p>
      <div class="title_division">Stereo Mode Dynamics</div>
      <p class="para_division">Menus and dialogs cannot be used while in stereo mode, and normal NX operations are not possible. However, stereo mode does allow certain special dynamics operations, which are explained below.</p>
      <p class="para_division">Press MB3 to display a non-Motif stereo mode menu that shows the available dynamics operations. To select an operation, move the cursor to an option on the menu and press MB1. You can also start a dynamics option by pressing the appropriate keyboard accelerator. Dynamics operations and their accelerators are shown in the following table.</p>
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               <p class="para_th">Stereo Mode Option</p>
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               <p class="para_th">Key Accelerator</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="middle">
               <p class="para_td">Mouse Rotate</p>
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               <p class="para_td">1 or F7</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="middle">
               <p class="para_td">Mouse Pan</p>
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               <p class="para_td">2</p>
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               <p class="para_td">Mouse Distance *</p>
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               <p class="para_td">3</p>
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               <p class="para_td">Continuous Rotate</p>
            </td>
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               <p class="para_td">4</p>
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               <p class="para_td">Eye Separation**</p>
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               <p class="para_td">5</p>
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               <p class="para_td">Refresh</p>
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               <p class="para_td">6 or F5</p>
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               <p class="para_td">Restore</p>
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               <p class="para_td">7</p>
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               <p class="para_td">Exit Stereo</p>
            </td>
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               <p class="para_td">0 or &lt;Esc&gt; or F12</p>
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               <p class="para_td">Spaceball/dials Dynamics</p>
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      </table><br><div class="title_division">* Mouse Distance</div>
      <p class="para_division">The Mouse Distance option is unique to stereo mode, and is not available in the ordinary use of NX. This option allows you to dynamically change the distance to the part. Since perspective is automatically enabled for stereo display, changing the distance causes the part to appear somewhat larger or smaller.</p>
      <div class="title_division">** Eye Separation</div>
      <p class="para_division">This function allows the user to adjust the stereo effect by changing the simulated distance between the virtual cameras or eyes of the viewer. The more distance between the simulated eyes, the more intense the stereo effect will be. Of course, when the eye separation is too large, the user may experience difficulty in visually consolidating the two images. This function is provided to allow adjustment of the separation of the images to maximize the stereo effect and still minimize eye discomfort. This function is also useful when viewing the images from a distance longer than usual, i.e. on a large screen.</p>
      <p class="para_division">To change eye separation, press the left mouse button and move it up or down (only vertical motion is registered; horizontal movements are ignored). Moving the cursor up from the starting point (the point where the left mouse button was pressed) increases eye separation while moving it down decreases it. Eye separation can not be negative and stops at zero at resulting in the left and right images being virtually the same.</p>
      <p class="para_division">The eye separation setting is initialized to the value specified by the Ugraf***.stereoParallax resource in the Ugraf*** resource file, if it is set. The resource can be set to low, medium or high. If the resource is unset, then the setting is initialized to medium.</p>
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               <p class="para_th">Stereo Depth Effect Resource</p>
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               <p class="para_th">Values</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="middle">
               <p class="para_td">Ugraf***.stereoParallax</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="middle">
               <p class="para_td">Low, Medium or High</p>
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      </table><br><table border="0">
         <tr>
            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
            <td valign="bottom" align="left" width="100%">
               <div class="para_note">
                  <p class="para_note_body">  This resource is not listed in the default Ugraf*** file supplied with NX.</p>
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      <div class="title_division">Exiting Stereo Mode</div>
      <p class="para_division">To exit stereo mode, select the Exit Stereo item from the stereo menu; or as stereo mode terminates, the original window size, layout and view orientation are restored.</p>
      <table border="0">
         <tr>
            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
            <td valign="bottom" align="left" width="100%">
               <div class="para_note">
                  <p class="para_note_body">   NX returns to the Gateway application when the stereo display mode is terminated, regardless of which application was active when it was enabled.</p>
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      <div class="title_division">Depth Perception</div>
      <p class="para_division">The sense of depth in a stereo display depends primarily on the parallax and perspective attributes that are automatically used when stereo mode is enabled. You can, however, take other steps to provide an effective impression of depth. You can:</p>
      <ul>
         <li>
            <p class="para_item">Turn ON fog in this dialog before enabling stereo mode.</p>
         </li>
         <li>
            <p class="para_item">Keep the part in motion (i.e., by rotating) while stereo mode is enabled. During rotation, portions of a part that are nearer move more rapidly than those farther away. This &quot;motion parallax&quot; contributes to the overall perception of depth.</p>
         </li>
         <li>
            <p class="para_item">While the part displays in front of the screen (because of parallax), try to prevent the part from intersecting the edge of the screen or window. When a part is partially obscured by an edge of the screen, the brain perceives the object as behind the screen, which can nullify the effect of parallax, reducing the sense of depth.</p>
         </li>
      </ul>
      <p class="para_division">A quality stereo display also depends on other factors, such as color. For example, when a bright green object is viewed in stereo, viewers may perceive &quot;ghosting&quot; around the object. The ghosting occurs when the right eye sees the phosphor afterglow on the monitor screen of the image intended for the left eye, and vice versa. Ghosting is worst with bright green because it has the longest afterglow, but can also occur with other bright colors and with highly contrasting colors. Users can experiment with various colors to select the ones that give the most pleasing stereo display.</p>
      <div class="title_division">Considerations with Stereo Mode</div>
      <p class="para_division">NX operations are limited in stereo mode because most workstation configurations support only &quot;full-screen&quot; stereo. In this most common form of stereo display, Motif menus, dialogs and window frames appear distorted. To avoid distortion when stereo mode is active, the NX graphics window is made full-screen, obscuring its other windows.</p>
      <p class="para_division">A few workstation configurations support &quot;per-window&quot; stereo, in which the X server better supports stereo. On these configurations, it is usually necessary to reconfigure the X server especially for stereo, and the reconfiguration usually causes changes in display behavior. In particular, while the X server is configured for stereo, screen resolution or color resolution may be reduced (e.g., a screen that normally supports 1280 x 1024 resolution may be required to operate at 960 x 680 resolution).</p>
      <p class="para_division">While stereo is enabled on per-window configurations, the NX graphics window remains its original size. However, even though you might be able to see some NX pull-down menus and options, most NX operations are disabled, the same as in the full-screen stereo configuration.</p>
      <p class="para_division">Refer to the Graphics Configuration Guide for information on stereo support on your workstation. After the CrystalEyes system is installed on a workstation, and the X server is reconfigured as necessary, a special &quot;stereo&quot; resource must be set to inform NX to allow stereo display. Set the following resource in the Ugraf*** file to true:</p>
      <p class="para_division">*Ugraf***.stereo: TRUE</p>
      <p class="para_division">This resource setting is required in order to discourage accidental enabling of stereo display when the CrystalEyes system is not installed.</p>
      <table border="0">
         <tr>
            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
            <td valign="bottom" align="left" width="100%">
               <div class="para_note">
                  <p class="para_note_body"> This resource is not listed in the default Ugraf*** file supplied with NX.</p>
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            </td>
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